Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/com/google/android/gms/cloudmessaging/CloudMessage.java

@@ -0,0 +1,173 @@
+package com.google.android.gms.cloudmessaging;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.util.Log;
+import com.google.android.gms.common.internal.safeparcel.AbstractSafeParcelable;
+import com.google.android.gms.common.internal.safeparcel.SafeParcelWriter;
+import com.google.android.gms.common.internal.safeparcel.SafeParcelable;
+import com.google.firebase.messaging.Constants;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.util.Map;
+import s.j;
+
+@SafeParcelable.Class(creator = "CloudMessageCreator")
+/* loaded from: classes3.dex */
+public final class CloudMessage extends AbstractSafeParcelable {
+    public static final Parcelable.Creator<CloudMessage> CREATOR = new zzb();
+    public static final int PRIORITY_HIGH = 1;
+    public static final int PRIORITY_NORMAL = 2;
+    public static final int PRIORITY_UNKNOWN = 0;
+
+    @SafeParcelable.Field(id = 1)
+    final Intent zza;
+    private Map zzb;
+
+    @Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
+    @Retention(RetentionPolicy.SOURCE)
+    /* loaded from: classes3.dex */
+    public @interface MessagePriority {
+    }
+
+    @SafeParcelable.Constructor
+    public CloudMessage(@SafeParcelable.Param(id = 1) Intent intent) {
+        this.zza = intent;
+    }
+
+    private static int zzb(String str) {
+        if (zza.zza(str, "high")) {
+            return 1;
+        }
+        return zza.zza(str, "normal") ? 2 : 0;
+    }
+
+    public String getCollapseKey() {
+        return this.zza.getStringExtra(Constants.MessagePayloadKeys.COLLAPSE_KEY);
+    }
+
+    /* JADX WARN: Type inference failed for: r1v0, types: [java.util.Map, s.j] */
+    public synchronized Map<String, String> getData() {
+        try {
+            if (this.zzb == null) {
+                Bundle extras = this.zza.getExtras();
+                ?? jVar = new j(0);
+                if (extras != null) {
+                    for (String str : extras.keySet()) {
+                        Object obj = extras.get(str);
+                        if (obj instanceof String) {
+                            String str2 = (String) obj;
+                            if (!str.startsWith(Constants.MessagePayloadKeys.RESERVED_PREFIX) && !str.equals(Constants.MessagePayloadKeys.FROM) && !str.equals(Constants.MessagePayloadKeys.MESSAGE_TYPE) && !str.equals(Constants.MessagePayloadKeys.COLLAPSE_KEY)) {
+                                jVar.put(str, str2);
+                            }
+                        }
+                    }
+                }
+                this.zzb = jVar;
+            }
+        } catch (Throwable th) {
+            throw th;
+        }
+        return this.zzb;
+    }
+
+    public String getFrom() {
+        return this.zza.getStringExtra(Constants.MessagePayloadKeys.FROM);
+    }
+
+    public Intent getIntent() {
+        return this.zza;
+    }
+
+    public String getMessageId() {
+        String stringExtra = this.zza.getStringExtra(Constants.MessagePayloadKeys.MSGID);
+        return stringExtra == null ? this.zza.getStringExtra(Constants.MessagePayloadKeys.MSGID_SERVER) : stringExtra;
+    }
+
+    public String getMessageType() {
+        return this.zza.getStringExtra(Constants.MessagePayloadKeys.MESSAGE_TYPE);
+    }
+
+    public int getOriginalPriority() {
+        String stringExtra = this.zza.getStringExtra(Constants.MessagePayloadKeys.ORIGINAL_PRIORITY);
+        if (stringExtra == null) {
+            stringExtra = this.zza.getStringExtra(Constants.MessagePayloadKeys.PRIORITY_V19);
+        }
+        return zzb(stringExtra);
+    }
+
+    public int getPriority() {
+        String stringExtra = this.zza.getStringExtra(Constants.MessagePayloadKeys.DELIVERED_PRIORITY);
+        if (stringExtra == null) {
+            if (zza.zza(this.zza.getStringExtra(Constants.MessagePayloadKeys.PRIORITY_REDUCED_V19), "1")) {
+                return 2;
+            }
+            stringExtra = this.zza.getStringExtra(Constants.MessagePayloadKeys.PRIORITY_V19);
+        }
+        return zzb(stringExtra);
+    }
+
+    public byte[] getRawData() {
+        return this.zza.getByteArrayExtra(Constants.MessagePayloadKeys.RAW_DATA);
+    }
+
+    public String getSenderId() {
+        return this.zza.getStringExtra(Constants.MessagePayloadKeys.SENDER_ID);
+    }
+
+    public long getSentTime() {
+        Bundle extras = this.zza.getExtras();
+        Object obj = extras != null ? extras.get(Constants.MessagePayloadKeys.SENT_TIME) : null;
+        if (obj instanceof Long) {
+            return ((Long) obj).longValue();
+        }
+        if (!(obj instanceof String)) {
+            return 0L;
+        }
+        try {
+            return Long.parseLong((String) obj);
+        } catch (NumberFormatException unused) {
+            Log.w("CloudMessage", "Invalid sent time: ".concat(String.valueOf(obj)));
+            return 0L;
+        }
+    }
+
+    public String getTo() {
+        return this.zza.getStringExtra(Constants.MessagePayloadKeys.TO);
+    }
+
+    public int getTtl() {
+        Bundle extras = this.zza.getExtras();
+        Object obj = extras != null ? extras.get(Constants.MessagePayloadKeys.TTL) : null;
+        if (obj instanceof Integer) {
+            return ((Integer) obj).intValue();
+        }
+        if (!(obj instanceof String)) {
+            return 0;
+        }
+        try {
+            return Integer.parseInt((String) obj);
+        } catch (NumberFormatException unused) {
+            Log.w("CloudMessage", "Invalid TTL: ".concat(String.valueOf(obj)));
+            return 0;
+        }
+    }
+
+    @Override // android.os.Parcelable
+    public void writeToParcel(Parcel parcel, int i) {
+        int beginObjectHeader = SafeParcelWriter.beginObjectHeader(parcel);
+        SafeParcelWriter.writeParcelable(parcel, 1, this.zza, i, false);
+        SafeParcelWriter.finishObjectHeader(parcel, beginObjectHeader);
+    }
+
+    public final Integer zza() {
+        if (this.zza.hasExtra(Constants.MessagePayloadKeys.PRODUCT_ID)) {
+            return Integer.valueOf(this.zza.getIntExtra(Constants.MessagePayloadKeys.PRODUCT_ID, 0));
+        }
+        return null;
+    }
+}